lec6 - Last Time Phase Changes: Tb, Tf Dynamic Equilibrium...

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1 Last Time • Phase Changes: T b , T f • Dynamic Equilibrium • Vapor Pressure • Phase Diagrams • Critical Point • Triple Point
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2 Liquid – Vapor Boundary • Proportional to P, T, Δ H vap • Described by Clausius – Clapyron ln(P) = constant – Δ H vap /RT • Convenient for finding T b ’s at different P ln(P 1 /P 2 ) = Δ H vap (1/T 2 – 1/T 1 )/R Solid – Vapor Boundary • Proportional to P, T, Δ H sub • Also described by Clausius – Clapeyron ln(P 1 /P 2 ) = Δ H sub (1/T 2 – 1/T 1 )/R Example Given that the vapor pressure of acetone at 7.7 ° C is 13 kPa and Δ H vap = 29.1 kJ/mol estimate the vapor pressure at room temperature. R = 8.314 J/K mol
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3 Phase Changes … In Context • Machinery good for one component • Breaks down for two or many components – Vapor pressures change – T b and T f change • Need to understand dissolving and solutions … new set of tools Solutions – The Language • Solvent – major component – solids, liquids or gases
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lec6 - Last Time Phase Changes: Tb, Tf Dynamic Equilibrium...

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